<template>
  <div class="login_container">
      <div class="login_box">
          <!-- 头像区域 -->
          <div class="avatar_box">
              <img src="../assets/logo.png" alt="">
          </div>
          <!-- 登陆表单区域 -->
          <el-form ref="loginFormRef" :model="loginFrom" :rules="loginFromRule" label-width="0px" class="login_from">
              <!-- 用户名 -->
              <el-form-item prop="username">
                  <el-input v-model="loginFrom.username" prefix-icon="el-icon-user-solid"></el-input>
              </el-form-item>
              <!-- 密码 -->
              <el-form-item prop="password">
                  <el-input v-model="loginFrom.password" type="password" prefix-icon="el-icon-lock"></el-input>
              </el-form-item>
              <!-- 按钮区域 -->
              <el-form-item class="btns">
                  <el-button type="primary" @click="login">登录</el-button>
                  <el-button type="info" @click="resetLoginFrom">重置</el-button>
              </el-form-item>
          </el-form>
      </div>
  </div>
</template>

<script>
export default {
  components: {},
  data() {
    return {
        //这是登录表单的数据绑定对象
        loginFrom:{
            username:'admin',
            password:'123456',
        },
        //这是表单的验证规则对象
        loginFromRule:{
            username:[
                { required: true, message: "请输入登录名称", trigger: 'blur' },
                { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
            ],
            password:[
                { required: true, message: "请输入登录密码", trigger: 'blur' },
                { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
            ]
        }
    };
  },
  methods: {
      //点击重置按钮，重置登陆表单
      resetLoginFrom(){
          //console.log(this);
          this.$refs.loginFormRef.resetFields();
      },
      login(){
          this.$refs.loginFormRef.validate(async vaild=>{
               //console.log(vaild);
               if(!vaild) return;
               const { data:res } = await this.$http.post("login",this.loginFrom);
               //console.log(res);
               //if(res.meta.status !==200) return console.log('登录失败');
               if(res.meta.status !==200) return this.$message.error('登录失败！');
               //console.log('登录成功');
               this.$message.success('登录成功！');

               //1.将登录成功之后的token，保存到sessionStorage中
               //   1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
               //   1.2token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
               window.sessionStorage.setItem("token",res.data.token)
               //2.通过编程式导航跳转到后台主页，路由地址是/home
               this.$router.push("/home");
          });
      }
  },
  created() {},
  mounted() {},
};
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;  //相对定位
    left: 50%;     //相对于左上角的点距上50%，左上角垂直居中
    top: 50%;     //相对于左上角的点距左50%，左上角水平居中
    transform: translate(-50%,-50%);   //要盒子居中就要减去盒子长高的一半修正位置

    .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd; //设置盒子的阴影
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}
.login_from{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 40px;
    box-sizing: border-box;   //盒子溢出处理
}
.btns{
    display: flex;
    justify-content: flex-end;
}
</style>